1. Chu Y. Chin Petrochem Ind, 2021, 5: 16–18 (in Chinese) [褚艳. 中国石油和化工产业观察, 2021, 5: 16–18].
2. Nitrogen rejection from natural gas by dual reflux-pressure swing adsorption using activated carbon and ionic liquidic zeolite
3. Wang LQ, Xie GF, Li M, Li J, An GN. Chin Coal, 2020, 46: 37–40 (in Chinese) [王临清, 解钢锋, 李敏, 李佳, 安广楠. 中国煤炭, 2020, 46: 37–40].
4. Yang FL, Xu HN. Chin Coal, 2021, 47: 73–82 (in Chinese) [杨方亮, 许红娜. 中国煤炭, 2021, 47: 73–82].
5. National Bureau of Statistics of the People’s Republic of China. Annual statistical data of the National Bureau of Statistics. Beijing, 2020 (in Chinese). https://data.stats.gov.cn/easyquery.htm?cn=C01 [中华人民共和国国家统计局. 国家统计局统计年度数据. 北京, 2020. https://data.stats.gov.cn/easyquery.htm?cn=C01].